CVE-2026-22864
Fixed upstream EPSS <1%CVSS 8.1
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.5.6, a prior patch aimed to block spawning Windows batch/shell files by returning an error when a spawned path’s extension matched .bat or .cmd. That check performs a case-sensitive comparison against lowercase literals and therefore can be bypassed when the extension uses alternate casing (for example .BAT, .Bat, etc.). This vulnerability is fixed in 2.5.6.
Products: denoland deno
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| crates.io | deno | 2.5.6 |